Word and Excel are now free for EDU.
In order to install and activate Word / Excel on your mac, please follow these instructions:
1. Go to the App store on the mac.
a. Search for "Word" - and install from App store.
b. Search for Excel...." "
a. Register your email & create a Free teacher account.
b. Might have to verify your account via email...etc.
3. Open Word, and in the bottom right, click the "Activate" button. Enter your new Microsoft account info. 
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Let me know if this process works for you?